BR102013018885B1 - composition - Google Patents

Abstract

composition - the present invention relates to a composition comprising a water-soluble dispersant comprising structural units of a sulfonic acid monomer or a salt thereof and a monomer. the dispersant of the present invention meets a need in the art for providing a way to improve the coverage efficiency of coating compositions.

Description

[001] The present invention relates to a polymeric composition useful in coating formulations. Inks containing associative rheology modifiers such as hydrophobically modified ethylene oxide / urethane thickeners (HEUR), hydrophobically modified alkali-soluble emulsion (HASE), hydrophobically modified hydroxyethylcellulose (HMHEC) cause the self-association of latex particles, which causes the titanium dioxide (T1O2) particles to self-associate (clump), which reduces the coating efficiency compared to the thickened composition with non-associative thickeners. This agglomeration effect occurs because associative rheology modifiers create a network with the binder in the ink system, thus agglomerating the T1O2 particles together. It would therefore be desirable to find a way to improve the coverage efficiency of coatings formulated with associative rheology modifiers.

Summary of the Invention [002] The present invention addresses a need in the art for providing a composition comprising a water-soluble dispersant comprising structural units of a sulfonic acid monomer or a salt thereof and structural units of one or more monomers selected from the group consisting of polyalkylene glycol acrylates, polyalkylene glycol methacrylates, vinyl pyrrolidinones, vinyl pyridines, acrylamidotrialalkylammonium halides, alkylamino acrylates (poly (alkylene oxide)), alkylamino methacrylates (poly (alkylene oxide)) alkylene)), and alkylammonium methacrylates (poly (ethylene oxide)), with the average molecular weight of the dispersant being 1,000 to 25,000 Daltons.

[003] The present invention meets a need in the art for

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2/15 providing a way to improve the coverage efficiency of compositions containing T1O2 associative rheology modifiers.

Detailed Description of the Invention [004] The present invention relates to a composition comprising a water-soluble dispersant comprising structural units of a sulfonic acid monomer or a salt thereof and structural units of one or more monomers selected from the group consisting of acrylates polyalkylene glycol, polyalkylene glycol methacrylates, vinyl pyrrolidinones, vinyl pyridines, acrylamidotrialalkylammonium halides, alkylamino acrylates (poly (ethylene oxide)), alkylamino methacrylates (poly (alkylene oxide)), acrylamides (alkyl) , and alkylammonium methacrylates (poly (alkylene oxide)), the average molecular weight of the dispersant being from 1,000 to 25,000 Daltons.

[005] The term "structural units" is used here to refer to groups that are formed by the polymerization of the corresponding polymer. Thus, a structural unit of 2- (meth) acrylamido-2-methyl-propanesulfonic acid is illustrated below:

where the dashed lines indicate the point of attachment in the main polymer structure [006] Examples of suitable sulfonic acid monomers include 2-acrylamido-2-methylpropane-sulfonic acid, vinyl-sulfonic acid, 2-sulfo-ethyl acrylate, 2-sulfo-ethyl methacrylate, 3-sulfo-propyl acrylate, 3-sulfo-propyl methacrylate, sodium styrene-sulfonate, and 2-propene-l-sulfonic acid, and salts thereof, and combinations thereof. The water-soluble dispersant preferably comprises at least 30%, more preferably at least

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3/15 minus 50%, 100%, more preferably 80% by weight of structural units of a sulfonic acid monomer, based on the weight of the dispersant. A particularly preferred sulfonic acid monomer is 2-acrylamido-2-methylpropane-sulfonic acid (AMPS).

[007] Examples of polyalkylene glycol acrylates and methacrylates include poly (ethylene glycol) methacrylates, poly (ethylene glycol) acrylates, lauryl-O (CH ₂ CH ₂ O) 23-methacrylate, CH3O (CH ₂ CH ₂ O) n-methacrylate , and HO (CH ₂ CH ₂ O) ₂ 3-methacrylate. Alkylamino (poly (alkylene oxide)) acrylates and methacrylates and include, mono- and dialkylamino (poly (ethylene oxide) acrylates and methacrylates), such as CH ₂ = CCH ₃ - (OCH ₂ CH ₂ ) i. 3rdNR ¹ R ² , where R ¹ is H or -Ci-C ² -alkyl, R ² is C3-C ² alkyl, and X 'is a counterion. Alkylammonium (poly (alkylene oxide)) acrylates and methacrylates include mono-, di-, and trialkylammonium (poly (ethylene oxide)) acrylates and methacrylates such as CH ₂ -CCH3-OCH ₂ CH ₂ ) N R'R ² R ³ , where R ¹ and R ³ are each independently hydrogen or C 1 -C 2 -alkyl; R ² is C3 -C12 alkyl; and X is a counterion. Suitable acrylamidotrialalkylammonium halides include [2- (acryloxy) ethyl] trimethylammonium chloride, [2- (methacryloxy) ethyl] trimethylammonium chloride and (3-methacrylamidopropyl) trimethylammonium chloride.

[008] The dispersant may additionally comprise structural units of one or more additional comonomers, examples of which include acrylates and methacrylates such as methyl methacrylate, ethyl acrylate, butyl acrylate, and ethylhexyl acrylate; dialkylaminoalkyl acrylates and methacrylates including 2- (N, N-dimethylamino) ethyl methacrylate (DMAEMA), 2 (N, N-dimethylamino) ethyl acrylate, 2- (N, N-diethylamino) ethyl acrylate, 2-acrylate (N, N-diethylamino) ethyl, 2- (t-butylamino) ethyl methacrylate, 3 (dimethylamino) propyl acrylate, 2-diisopropylaminoethyl methacrylate, and 3dimethylaminoneopentyl acrylate; styrenes; hydroxyalkyl acrylates and methacrylates such as hydroxyethyl methacrylate and hydroxypropyl acrylate; dialkylaminoalkylacrylamides and methacrylamides including N- [2- (N, N

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4/15 dimethylaminoethyl] methacrylamide, N- [3- (N, N-dimethylamino) propyl] acrylamide, and N [3- (N, N-dimethylamino) propyl] methacrylamide.

[009] The dispersant preferably contains a substantial absence of structural units of acid monomers containing phosphorus and salts thereof. The term substantial absence of phosphorus-containing acid monomer structural units and salts thereof is used to refer to a dispersant having less than 0.1, more preferably less than 0.01, and much more preferably 0 weight percent structural units of a phosphorus-containing acid monomer such as phosphoethyl methacrylate or a salt thereof. Preferably, the dispersant contains less than 10 weight percent structural units of an acrylic acid or methacrylic acid monomer, based on the weight of the dispersant.

[0010] In a preferred embodiment, the dispersant comprises 30 to 99 weight percent structural units of a sulfonic acid monomer or a salt thereof and 10 to 50 weight percent structural units of a polyethylene glycol methacrylate, with based on the weight of the dispersant.

[0011] In a preferred embodiment, the structural units of the sulfonic acid monomer or a salt thereof comprise at least 30 weight percent of the dispersant provided that the dispersant additionally includes 5 to 25 weight percent of structural units of a dialkylaminoalkyl methacrylate and 5 to 50 weight percent structural units of a dialkylamino methacrylate (poly (ethylene oxide)), each based on the weight of the dispersant.

[0012] The dispersant has a weight average molecular weight (M _w ) of 1,000, preferably 2,000 Daltons, at 25,000, preferably 15,000, and more preferably at 8,000 Daltons. The dispersant is useful in combination with latex particles and pigment particles, especially

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5/15 T1O2 particles, to form a dispersion of composite particles that improves the coating efficiency in coating formulations.

[0013] The dispersion of composite particles is especially suitable for coating formulations containing an associative thickener (e.g., HEUR, HASE and HMHEC thickeners), although it can be used with non-associative thickeners such as HEC thickeners. Although not bound by theory, the dispersant is believed to be effective in stimulating the rapid adsorption of latex particles on the surface of pigment particles such as T1O2 particles to form composites. Consequently, the dispersant creates more ideally spaced T1O2 particles with concomitant improvement in coverage.

[0014] The composition of the present invention advantageously includes a pigment such as ΊΊΟ2; an aqueous dispersion of polymer particles such as acrylic latex, styrene acrylic particles, vinyl acetate / acrylic, or vinyl acetate / ethylene; a rheology modifier, examples of which include associative thickeners (e.g., HEURs, HASEs, and HMHECs); non-associative thickeners (eg, alkali-soluble emulsions (ASEs), cellulosics such as hydroxy-ethyl-celluloses (HECs), hydroxy-methyl-ethyl-celluloses (HMECs), and hydroxy-propyl-celluloses (HPCs); and, clays synthetic as Laponite.The aqueous composition can also include any of numerous materials including opaque polymers; fillers; pigments and dyes, including opaque pigments and encapsulated or partially encapsulated pigments; other dispersants; wetting aids; dispersion aids; dispersing aids; other rheology modifiers; surfactants; co-solvents; coalescing and plasticizing agents; defoamers; preservatives; anti-deterioration additives; flow agents; leveling agents; slip additives; and neutralizing agents.

Examples [0015] The following examples are for illustrative purposes only

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6/15 and are not intended to limit the scope of the invention.

[0016] Each of the polymeric dispersants was prepared using a commercially available high speed processing polymerization reactor, ScPPR, reactor available from Freeslate. In each example and comparative example, 10% by weight polymeric dispersant solution with pH adjusted to 9 was used.

Intermediate 1: Preparation of dibutylamino-poly (ethylene oxide) (4) -methacrylate monomer [0017] Methacrylic anhydride (10 g, 65 mmol), (4-hydroxy-2,2,6,6tetramethylpiperidin-l-yl) oxidanil (4-Hydroxy-TEMPO, 0.005 g, 0.03 mmol), and dibutylamino-poly (ethylene oxide) (4) -alcohol (19.8 g, 65 mmol) were added in a 59 cm ³ glass vial . The contents of the flask were heated to 50 ° C for 1 h. Analysis by spectroscopy of 'H NMR showed conversion of 80% to dibutylamino-poly (ethylene oxide) (4) -methacrylate. Example 1: HEUR thickened paint composition containing TiCh A. Synthesis of polymeric dispersant [0018] Quantities and concentration of feeds included Dl water (0.62 g); solution of 2-acrylamido-2-methylpropane-sulfonic acid (AMPS) in water (7.5 g, 40% by weight solution), 3-mercapto-1-propanol in dimethylformamide (DMF) (0.33 g, solution to 9.1% by weight); and 2,2-azo-bis (2-methylpropionamidine) dihydrochloride in water (0.33 g, 9.1 wt% solution). The reactor cell was purged with nitrogen followed by an initial charge of water and 10% monomer feeds, chain transfer agent, and initiator. The temperature was increased to 80 ° C, the agitation was adjusted to 400 rpm and 69 kPa of nitrogen pressure gauges. The remaining 90% of the monomer, chain transfer agent, and initiator feeds were fed in a series of automatic steps over a period of 100 min. A second starter feed, 2,2-azo dihydrochloridePetition 870200011835, from 1/24/2020, p. 13/29

7/15 bis (2-methylpropionamidine) (0.165 g, 9.1% by weight aqueous solution) was added at once and the reactor temperature was raised to 85 ° C. Stirring was continued for an additional 30 min followed by cooling the reactor to room temperature. The pH of the reaction flask was adjusted to pH 8-9 with 28% ammonium hydroxide solution. The polymer was precipitated in THF and dried under vacuum at 60 ° C for 4 days.

B. Example of paint 1 with TiCE dispersion containing HEUR thickener [0019] The TiCE dispersion was prepared by combining Dl water (1.10 g), polymeric dispersant solution (0.70 g) and Ti-Pure R- 706 TiCE (4.69 g) in a 50 g “FlackTec SpeedMixer” beaker followed by mixing at 2,200 RPM for a combined mixing time of 6 min. Addition of HEUR (18.72 g) penetration paint (Dl water (18.95% by weight), Texanol (2.98% by weight), rheology modifier “ACRYSOL ™ RM-2020 NPR Rheology Modifier” (3% by weight), rheology modifier “ACRYSOL ™ RM-825 Rheology Modifier” (0.08% by weight), RHOPLEX ™ SG-10M Binder (74.45% by weight), and Non-tonic surfactant “TERGITOL 15-S -9 ”(0.57% by weight) in the dispersion of T1O2 and mixing at 2,200 RPM for 3 min in the FlackTec SpeedMixer mixer gave the formulated ink that was used for testing.

Example 2: Synthesis of polymeric dispersant [0020] Quantities and concentration of feeds included Dl water (0.69 g, solution of 2-acrylamido-2-methylpropane-sulfonic acid (AMPS) in water (6.03 g, solution at 40 % by weight), 2 (dimethylamino) ethyl methacrylate (DMAEMA) in water (1.18 g, 50% by weight solution), 3-mercapto-1-propanol in dimethylformamide (DMF) (0.33 g, solution to 9.1% by weight), and 2,2-azo-bis (2-methylpropionamidine) dihydrochloride in water (0.33 g, 9.1% by weight solution). The polymerization reaction was carried out under the conditions substantially equal to those described in Example IA. A TiCE dispersant composite was prepared followed by the preparation of a

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8/15 ink formulation (Ink Example 2), as described in Example 1B. Example 3: Synthesis of polymeric dispersant [0021] Quantities and concentration of feeds included water Dl: (0.125 g); solution of 2-acrylamido-2-methylpropane-sulfonic acid (AMPS) in water (6.49 g, 35.29% by weight solution); solution of dibutylamino-poly (ethylene oxide) (4) -methacrylate (intermediate 1) in DMF (0.48 g, 54.02% by weight solution); 2- (dimethylamino) ethyl methacrylate (DMAEMA) in water (0.83 g, 54.02% by weight solution); 3-mercapto-lpropanol in DMF (0.33 g, 9.1 wt% solution); and 2,2azo-bis (2-methylpropionamidine) dihydrochloride in water (0.33 g, 9.1 wt% solution). The polymerization reaction was carried out under conditions substantially the same as those described in Example IA. A dispersion-TiCL composite was prepared followed by the preparation of an ink formulation (Ink Example 3), as described in Example 1B.

Example 4: Synthesis of polymeric dispersant [0022] Quantities and concentration of feeds included water Dl: (1.25 g); solution of 2-acrylamido-2-methylpropane-sulfonic acid (AMPS) in water (5.27 g, 40% by weight solution); solution of laurylpoly (ethylene oxide) (23) -methacrylate (lauryl EO23 MA) in DMF (0.78 g, 55% solution by weight); 2- (dimethylamino) ethyl methacrylate (DMAEMA) in water (1.18 g, 50% by weight solution); cysteamine hydrochloride in water (0.16 g, 9.1% by weight solution); and 2,2-azo-bis dihydrochloride (2-methylpropionamidine) in water (0.33 g, 9.1 wt% solution). The polymerization reaction was carried out under conditions substantially the same as those described in Example IA. A dispersion-TiCL composite was prepared followed by the preparation of an ink formulation (Ink Example 4), as described in Example 1B.

Example 5: Synthesis of polymeric dispersant [0023] Quantities and concentration of feeds included water

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9/15

DI: (0.86 g); solution of 2-acrylamido-2-methylpropane-sulfonic acid (AMPS) in water (4.82 g, 40% by weight solution); 2 (dimethylamino) ethyl methacrylate (DMAEMA) in water (0.94 g, 40% by weight solution); polyethylene glycol methacrylate (PEGMA) in water (1.2 g, 50% by weight solution); 3-mercapto-1-propanol in DMF (0.33 g, 9.1 wt% solution); and 2,2-azo-bis (2-methylpropionamidine) dihydrochloride in water (0.33 g, 9.1 wt% solution). The polymerization reaction was carried out under conditions substantially the same as those described in Example IA. A dispersant-TiCL composite was prepared followed by the preparation of an ink formulation (Ink Example 5), as described in Example 1B.

Example 6: Synthesis of polymeric dispersant [0024] Quantities and concentration of feeds included water Dl: (0.89 g); solution of 2-acrylamido-2-methylpropane-sulfonic acid (AMPS) in water (3.01 g, 40% by weight solution); 2 (dimethylamino) ethyl methacrylate (DMAEMA) in DMF (0.59 g, 50% by weight solution); polyethylene glycol methacrylate (PEGMA) in water (1.20 g, 50% by weight solution); n-butyl acrylate (BA) in DMF (1.80 g, 50% by weight solution); 3-mercapto-1-propanol in DMF (0.33 g, 9.1 wt% solution); and 2,2-azo-bis (2-methylpropionamidine) dihydrochloride in water (0.33 g, 9.1 wt% solution). The polymerization reaction was carried out under conditions substantially the same as those described in Example IA. A TiO2 dispersant composite was prepared followed by the preparation of an ink formulation (Ink Example 6), as described in Example 1B.

Example 7: Synthesis of polymeric dispersant [0025] Quantities and concentration of feeds included water Dl: (3.86 g); solution of 2-acrylamido-2-methylpropane-sulfonic acid (AMPS) in water (3.5 g, 40% by weight solution); t-butyl acrylate (BA) in DMF (1.2 g, 50% by weight solution); cysteamine hydrochloride in water (0.22 g, 9.1% by weight solution); and 2,2-azo-bis dihydrochloride (2

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10/15 methylpropionamidine) in water (0.221 g, 9.1% solution by weight). The polymerization reaction was carried out under conditions substantially the same as those described in Example IA. A dispersant-TiCE composite was prepared followed by the preparation of an ink formulation (Ink Example 7), as described in Example 1B.

Example 8: Synthesis of polymeric dispersant [0026] Quantities and concentration of feeds included water Dl: (2.07 g); sodium styrene sulfonate (SSS) in water (5.25 g, 20% by weight solution); polyethylene glycol methacrylate (PEGMA) in water (1.19 g, 40% by weight solution); cysteamine hydrochloride in water (0.16 g, 9.1% by weight solution); and 2,2-azo-bis (2-methylpropionamidine) dihydrochloride in water (0.168 g, 9.1 wt% solution). The polymerization reaction was carried out under conditions substantially the same as those described in Example IA. A dispersant-TiCE composite was prepared followed by the preparation of an ink formulation (Ink Example 8), as described in Example 1B. Example 9: Synthesis of polymeric dispersant [0027] Quantities and concentration of feeds included water Dl: (3.92 g); potassium salt of 3-sulfo-propyl acrylate (SPA) in water (3.5 g, 40% by weight solution); n-butyl acrylate (BA) in DMF (1.2 g, 50% by weight solution); cysteamine hydrochloride in water (0.22 g, 9.1% by weight solution); and 2,2-azo-bis (2-methylpropionamidine) dihydrochloride in water (0.221 g, 9.1% by weight solution. The polymerization reaction was carried out under conditions substantially the same as those described in Example IA. dispersant-TiCE composite followed by the preparation of an ink formulation (Ink Example 9), as described in Example 1B Example 10: Synthesis of polymeric dispersant [0028] Quantities and concentration of feeds included Dl water: (0.704 g); solution of 2-acrylamido-2-methylpropane-sulfonic acid in water (4.5 g, 40% by weight solution), methyl methacrylate (MMA) in DMF

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11/15 (2.25 g, 40% by weight solution); methacrylic acid (MAA) in water (0.75 g, 40% by weight solution); cysteamine hydrochloride (0.33 g, 9.1% by weight solution); and 2,2-azo-bis (2-methylpropionamidine) dihydrochloride in water (0.33 g, 9.1 wt% solution). The polymerization reaction was carried out under conditions substantially the same as those described in Example IA. A dispersant-TiCE composite was prepared followed by the preparation of an ink formulation (Ink Example 10), as described in Example 1B. Comparative Example 1: Synthesis of polymeric dispersant [0029] Sample of commercially available polymeric dispersant, “TAMOL ™ 1254 Dispersant” dispersant, was used in this example. Dispersant-TiO2 composite was prepared followed by the preparation of an ink formulation (Comparative Ink Example 1), as described in Example 1B.

Comparative Example 2: Synthesis of polymeric dispersant [0030] Quantities and concentration of feeds included water Dl: (0.176 g); 2-methyl-2-propenoic acid, 2- (phosphonooxy) ethyl ester (PEM) in water (7.5 g, 40% solution by weight); cysteamine hydrochloride in water (0.33 g, 9.1% by weight solution); and 2,2-azo-bis dihydrochloride (2-methylpropionamidine) in water (0.33 g, 9.1 wt% solution). A TiCE dispersant composite was prepared followed by the preparation of an ink formulation (Comparative Ink Example 2), as described in Example 1B.

Comparative Example 3: Synthesis of polymeric dispersant [0031] Polymerization was carried out in a commercially available high-speed polymerization reactor (ScPPR reactor). Quantities and concentration of feeds included water Dl: (0.91 g); solution of 2-acrylamido-2-methylpropane-sulfonic acid in water (5.25 g, 40% by weight solution); methacrylic acid (MAA) in water (2.25 g, 40% by weight solution); cysteamine hydrochloride in water (0.33 g,

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12/15

9.1% by weight); and 2,2-azo-bis (2-methylpropionamidine) dihydrochloride in water (0.33 g, 9.1 wt% solution). A TiCh dispersant composite was prepared followed by the preparation of an ink formulation (Comparative Ink Example 3), as described in Example 1B.

Kubelka-Munk S / mil (mil; 1 mil = 25.4 µm) test method [0032] Coverings were prepared in a Symyx coating station on black removable paper panels (Leneta RC-B-1 wallets) ) using a 5.08 cm scraper blade with a 3 mil interstitium (76.2 pm). The coatings were dried in a constant temperature / relative humidity laboratory for one day. The Y-reflectance was measured in the “Symyx Color Gloss Thickness” (CGT) module using an “Ocean Optics ISP-REF integrating Sphere” with a 1.0 cm sampling aperture connected to an “Ocean Optics USB 4000” spectrometer. A 2.54 cm x 5.08 cm rectangle was cut from the center of the coating sample using a “Naef and Clicker Cutter Press” cutter press. The weights of the rectangle samples were measured on an analytical balance. Electrical tape was used to cleanly remove the entire coating followed by measuring the weight of the uncoated rectangle on an analytical balance. For each paint sample, 4 repeated coatings were tested and the Kubelka / Munk mean S coefficient (used to characterize the coverage property) was calculated using Equation 1.

Equation 1:

S = - Xx (l- /? ² ) ₁ _R _{] L}

R where X is the average thickness of the film, R is the estimated reflectance of the thick film (R = 0.94) and R _B is the average reflectance on the black of the thin film (equal to Y as measured by the color experiment). X can be calculated from the weight of the paint film (W _P f), the density (D) of the dry film; and the area of

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13/15 film (A), as described in Equation 2.

Equation 2:

_Ví , W _pf (g) xim.mil/in)

X (mils) = ----------------------- 1 ---------------- D (lbs! Ga /)xl.964(g / in I lbs! gal) xA (in) (1 mil = 25.4 μηι)

Centrifugation and adsorption test method [0033] Dl water (24.59 g) was added to each composite mixture (15.41 g) and mixed on a shaker roller at 15 rpm for 15 min. Each sample was then centrifuged at 7,000 rpm at 25 ° C for 15 min using a “Sorvall Legend X1R” centrifuge equipped with a fixed angle rotor F15-8x50cy. Control samples were prepared using the same loading of RHOPLEX SG-10M Acrylic Latex (5.41 g) in Dl water (27.21) without the dispersant and TiO ₂ . The percentage of supernatant solids in each sample was determined by pipetting approximately 3 g of solution into a tared aluminum crucible and drying in an oven at 150 ° C while recording the dry weight of the sample. The amount of latex adsorption was calculated using Equation 3:

Equation 3:

Ad (%) =

x 100% where Wi, s is the initial weight of the sample supernatant, W / s is the final weight of the dry sample supernatant, Wi, c is the initial weight of the control supernatant, and Wfc is the final weight of the sample supernatant. dry control. Following the Kubelka-Munk coefficient determination method S (thousand; 1 thousand = 25.4 pm) and using Equation 1, S / thousand was calculated for each ink; the results can be found in Table 1.

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Table 1 - S / mil (pm) of paints with HEUR thickener at 16 PVC of T1O2 (16% by volume of T1O2 and 84% by volume of latex solids)

Ink Example No. Dispersant monomers (% by weight) S / thousand (μπι) 1 AMPS (100%) 6.55 (166.37) 2 AMPS (80%), DMAEMA (20%) 6.45 (163.83) 3 AMPS (76%), Intermediate 1 (7%), DMAEMA (15%), MAA (2%) 7.20 (182.88) 4 AMPS (67%), MAA (4%), DMAEMA (19%), lauryl-EO23MA (10%) 6.45 (163.83) 5 AMPS (64%), DMAEMA (16%), PEGMA (20%) 6.76 (171.70) 6 AMPS (40%), DMAEMA (10%), BA (30%), PEGMA (20%) 6.67 (169.42) 7 AMPS (70%), BA (30%) 7.25 (184.15) 8 SSS (69%), PEGMA (31%) 7.24 (183.90) 9 SPA (70%) / BA (30%) 6.90 (175.26) 10 AMPS (60%), MMA (30%), MAA (10%) 6.10 (154.94) Comp. 1 MAA, AA 4.63 (117.60) Comp. 2 PEM (100%) 5.09 (129.29) Comp. 3 AMPS (70%), MAA (30%) 4.25 (107.95)

[0034] Table 1 shows that HEUR-modified paint containing the dispersant of the present invention shows a remarkable improvement in coverage compared to a paint thickened with the same HEUR but containing a thickener outside the scope of the present invention. Measurement of dispersant adsorption in TiO?

[0035] The dispersant-TiO2 composites of Examples 1, 2, 3, 5, and Comparative Example 1 (10.00 g, 43 PVC; 43% by volume of T1O2 and 57% by volume of latex solids), were separately combined with RHOPLEX SG-10M Acrylic Latex (5.41 g); each sample was then mixed on a shaking roller at 15 rpm overnight in a 40 ml centrifuge tube [0036] Following the latex adsorption and centrifugation test method and using Equation 3, the percentage of latex adsorbed was calculated for TiO2 dispersant composites and is shown in Table 2. The amount of latex adsorbed is the percentage by weight of latex present within the sample that was decreased during centrifugation and is assumed to be adsorbed on the pigment.

Table 2: Latex adsorption in 43 PVC-TiCL dispersant composites

T1O2 (43% by volume of T1O2 and 57% by volume of latex solids)

Example # Dispersant monomers (% by weight) Adsorbed latex (% by weight) 1 AMPS (100%) 68% 2 AMPS (80%), DMAEMA (20%) 67% 3 AMPS (76%), Intermediate 1 (7%), DMAEMA (15%), MAA (2%) 63% 5 AMPS (64%), DMAEMA (16%), PEGMA (20%) 69% Comp. 1 MAA, AA 2%

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15/15 [0037] Table 2 shows that compositions containing the dispersant of the present invention show a remarkable improvement in latex adsorption compared to a composition with the same latex and T1O2 but containing a dispersant that does not include structural units of an acid sulfonic acid such as AMPS.

Claims (6)

1. Composition, characterized by the fact that it comprises a water-soluble dispersant comprising structural units of a sulfonic acid monomer or a salt thereof and structural units of one or more monomers selected from the group consisting of polyalkylene glycol acrylates, polyalkylene glycol methacrylates, acrylamidotrialalkylammonium halides, alkylamino acrylates (poly (alkylene oxide)), alkylamino methacrylates (poly (alkylene oxide)), alkylammonium acrylates (poly (alkylene oxide)), alkylammonium methacrylates (poly (alkylene oxide) , vinylpyrrolidinones, and vinylpyridines, with the average molecular weight of the dispersant being 1,000 to 25,000 Daltons. 2. Composition according to claim 1, characterized by the fact that the sulfonic acid monomer is at least one monomer selected from the group consisting of 2-acrylamido-2-methylpropanesulfonic acid, vinyl-sulfonic acid, 2-sulfo- ethyl, 2-sulfo-ethyl methacrylate, sulfo-propyl acrylate, sulfo-propyl methacrylate, sodium styrenesulfonate, and 2-propene-1-sulfonic acid, and salts thereof. Composition according to claim 1 or 2, characterized in that the dispersant comprises from 10 to 50 weight percent of structural units of a polyethylene glycol methacrylate and additionally comprises from 5 to 25 weight percent of structural units from a dialkylaminoalkyl methacrylate and at least 30 weight percent structural units of sulfonic acid monomer. Composition according to claim 1 or 2, characterized in that the dispersant comprises from 5 to 50 weight percent structural units of a dialkylamino methacrylate (poly (ethylene oxide)) and additionally comprises from 5 to 25 weight percent of structural units of a methacrylate of Petition 870200011835, of 24/01/2020, p. 23/29 2/2 dialkylaminoalkyl. Composition according to any one of claims 1 to 4, characterized in that the dispersant comprises less than 10 weight percent structural units of an acrylic acid or methacrylic acid monomer. Composition according to any one of claims 1 to 5, characterized in that the sulfonic acid monomer is 2-acrylamido-2-methylpropane-sulfonic acid or 3-sulfo-propyl acrylate or a salt thereof; and that the weight average molecular weight of the dispersant is 2,000 to 8,000 Daltons.